6J5P is a miniature version of 6J4, equivalent of 6AC7. Very nice both in triode and pentode modes, with idle current about 10 mA.

6N16B is a tiny 6SN7-like tube. I wanted to use an interstage transformer, but decided to use cathode follower instead, so 6N16B will fit well under the chassis. 6N1P or 6N6P would require additional socket.

What is the criteria for a cathode follower? Correct me if I am wrong, but I thought it is supposed to provide a low output impedance with high current capability? Or in this case, the 6N16B is sufficient to provide the drive current for the 4P1L?

It is to provide less variable current load for coupling capacitor. Classes AB1 and AB2 exist in textbooks only. Grid current is always variable, check for example any vacuum diode curve. But when you are listening to real sounds, especially using tiny output power amp, chances that input signal hit grid positive current are high, so distortions caused by bias shift are inevitable. That's why either coupling transformers, or cathode follower, or even source follower are used to drive output tube. 6N16B is quite capable to drive 4P1L grid.

that would be running the output tubes very hot. looking up specs for the output tubes, max V=200V, max current 35mA. but maybe as you said, these were built to higher specs than published in fear of the Gestapo.

that would be running the output tubes very hot. looking up specs for the output tubes, max V=200V, max current 35mA. but maybe as you said, these were built to higher specs than published in fear of the Gestapo.

I can't find Telefunken datasheet for the original, but Alexander from Israel found that it is the best sounding regime.

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